Create 'fluo remove' command

[mikewalch]

After a Fluo application is initialized using fluo init, metadata exists for the application in Zookeeper. Currently, there is no way to remove this metadata without using the Zookeeper CLI It would be good to have a fluo remove command that removes this metadata.

[blueshift-brasil]

I started to implement this doing the same thing the init -f does but without the init part.
But I was wondering what happen if I remove the tables and the zookeeper data without stop the oracle and the workers before. Maybe apply the same validation of the init command:

if (admin.applicationRunning()) {
    System.err.println("Error - The Fluo '" + config.getApplicationName() + "' application"
        + " is already running and must be stopped before running 'fluo init'. "
        + " Aborted initialization.");
    System.exit(-1);
}

OR we could store the PID of the workers and oracle in a file like .[APP_NAME]woker01.pid, .[APP_NAME]worker02.pid, APP_NAME]_oracle01.pid.... and when a remove command it is called if a --force flag we could find and kill this processes too.

And... If we have the PID files we could implement commands like:

fluo worker -a myapp -k
fluo oracle -a myapp -k

AND

fluo worker -a myapp --kill
fluo oracle -a myapp --kill

[mikewalch]

I think the first option is the best. You should check to see if the application is running and abort if it is. I was thinking the remove command was only run once from one node (like the init command). It just cleans up metadata in Zookeeper and drops the Accumulo table. Stopping processes is tricky as they could be running locally, in YARN, Marathon, or Kubernetes.

[kennethmcfarland]

This issue is the same as #529 from what I can tell.

[kennethmcfarland]

Can we close this? Can we close #529?

[mikewalch]

Closed by #999